Fight Back to School 3

Police officer Chow Sing Sing receives a strange undercover assignment when millionaire Million Wong is murdered. Investigators discover that Chow closely resembles the victim, giving him the opportunity to impersonate Wong. Pretending to suffer from amnesia, Chow enters the dead man's world to uncover the truth, but soon discovers that wealth, power, and hidden enemies make the mission extremely dangerous. AKA To hok wai lung III.